#!/usr/bin/env python3
# -*- coding: utf-8 -*-
' main entry '
__author__ = 'pingwu you'

def power(x):
    #浮点数也是要进行精度比较的！！！
    v1 = 1.0 / 10
    v2 = 1 - 9.0 / 10
    print("1.0 / 10 结果："+str(v1))
    print("1 - 9.0 / 10 结果："+str(v2))
    print(x*x)
    return x*x
